Vulnerability-Lookup

CVE-2026-67339 (GCVE-0-2026-67339)

Vulnerability from cvelistv5 – Published: 2026-08-01 12:22 – Updated: 2026-08-03 18:08

Title

guzzlehttp/guzzle before 7.14.2 Proxy-Authorization Header Disclosure

Summary

guzzlehttp/guzzle versions before 7.14.2 fail to properly isolate Proxy-Authorization headers from origin servers in cURL handlers. Attackers can capture proxy credentials through origin server access logs when requests are redirected, bypassed, or sent through SOCKS proxies that Guzzle misclassifies as direct connections.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor

Assigner

VulnCheck

References

2 references

URL	Tags
https://github.com/guzzle/guzzle/security/advisor…	vendor-advisory
https://www.vulncheck.com/advisories/guzzlehttp-g…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
guzzle	guzzle	Affected: 0 , < 7.14.2 (semver) Unaffected: 7.14.2 (semver)

Date Public

2026-07-14 00:00

Credits

GrahamCampbell

Show details on NVD website

JSON

To clipboard

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GHSA-32RQ-JHR7-M3HH

Vulnerability from github – Published: 2026-08-01 15:30 – Updated: 2026-08-04 12:49

Summary

Duplicate Advisory: Guzzle: Proxy-Authorization headers can be sent to origin servers

Details

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-94pj-82f3-465w. This link is maintained to preserve external references.

Original Description

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

6.9 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c 7.14.2"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "guzzlehttp/guzzle"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-200"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-04T12:49:04Z",
    "nvd_published_at": "2026-08-01T13:17:04Z",
    "severity": "MODERATE"
  },
  "details": "## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of\u00a0GHSA-94pj-82f3-465w. This link is maintained to preserve external references.\n\n## Original Description\n\nguzzlehttp/guzzle versions before 7.14.2 fail to properly isolate Proxy-Authorization headers from origin servers in cURL handlers. Attackers can capture proxy credentials through origin server access logs when requests are redirected, bypassed, or sent through SOCKS proxies that Guzzle misclassifies as direct connections.",
  "id": "GHSA-32rq-jhr7-m3hh",
  "modified": "2026-08-04T12:49:43Z",
  "published": "2026-08-01T15:30:29Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/guzzle/guzzle/security/advisories/GHSA-94pj-82f3-465w"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67339"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-proxy-authorization-header-disclosure"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ],
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  "withdrawn": "2026-08-04T12:49:04Z"
}

GHSA-94PJ-82F3-465W

Vulnerability from github – Published: 2026-07-20 21:46 – Updated: 2026-08-04 12:49

Summary

Guzzle: Proxy-Authorization headers can be sent to origin servers

Details

Impact

In affected versions, the built-in cURL handlers (CurlHandler and CurlMultiHandler) put every first-class request header in cURL's origin header list (CURLOPT_HTTPHEADER). These handlers are the default when the PHP cURL extension is available. They move Proxy-Authorization to the proxy-only list (CURLOPT_PROXYHEADER) only when Guzzle predicts an HTTP or HTTPS proxy. A "first-class" header is part of the normal request message and can be set on a PSR-7 request, through client headers defaults, the headers request option, or middleware. It does not include a literal line supplied through raw CURLOPT_HTTPHEADER, CURLOPT_PROXYHEADER, or stream_context.http.header controls.

Because that migration follows Guzzle's prediction rather than the route libcurl actually takes, the credential stays in the origin list and is sent to the origin server when a request is:

direct, including proxy set to '' to disable proxying.
bypassed by a no, no_proxy, or NO_PROXY match.
sent through a SOCKS proxy, which does not use the HTTP proxy header channel.
redirected from a safely proxied hop into any of those routes: redirect middleware re-evaluates the proxy per hop but, unlike Authorization and Cookie, does not strip Proxy-Authorization cross-origin.

On installations whose libcurl is older than 7.37.0, or whose PHP cURL extension lacks CURLOPT_PROXYHEADER, CURLOPT_HEADEROPT, and CURLHEADER_SEPARATE, no proxy-only channel is available, so cURL left the header in the origin list for every route. The stream handler also serialized first-class values before selecting a proxy. PHP removes only the first Proxy-Authorization line from CONNECT, so another first-class value or a URL-userinfo Basic line could reach the tunneled origin. A later raw stream_context.http.proxy override could instead reroute either credential directly to the origin.

The disclosed value is a private credential meant only for the proxy. RFC 9110 defines Proxy-Authorization as credentials for the next inbound proxy, and an origin is never an intended recipient. The flaw can silently give a working proxy credential to an unrelated third party. In the worst case, an attacker controls the origin and records the credential through access logs, tracing systems, or application logs. If it remains valid, the attacker can abuse a paid or access-controlled proxy, impersonate the proxy principal, or reach destinations the proxy is trusted to reach. A strong remote exploit is possible when an application sends a request to an attacker-controlled HTTP URL through a proxy with a default Proxy-Authorization header, then follows the attacker's redirect to an HTTPS or no-proxy destination that Guzzle reaches directly.

Using a first-class Proxy-Authorization header is a legitimate, documented configuration, so affected applications are not misusing the library. Guzzle does not create this field, so applications that never configure one are unaffected by the first-class-header flaw. Proxy URL userinfo is not affected on its own, but the stream handler could expose its Basic line when combined with a first-class field or a later raw stream_context.http.proxy override. CURLOPT_PROXYUSERPWD is unaffected. Literal lines supplied through raw CURLOPT_HTTPHEADER, CURLOPT_PROXYHEADER, or stream_context.http.header remain caller-controlled and outside the first-class-header guarantee.

Patches

The issue is fixed in 7.14.2. The cURL handlers keep first-class Proxy-Authorization values out of the origin header list. When proxy header separation is available, they pass the values through CURLOPT_PROXYHEADER with CURLHEADER_SEPARATE. An empty value uses cURL's semicolon form to suppress credentials from proxy URL userinfo. On older builds, Guzzle drops the field for direct, bypassed, and SOCKS routes, but fails before network I/O if the request might use an HTTP or HTTPS proxy.

The stream handler removes the field from origin headers before choosing a route. If it selects a proxy, it accepts one value, including empty, writes a validated proxy header, and gives that value precedence over proxy URL userinfo. Multiple values, line breaks, and raw proxy overrides that could reroute generated credentials fail before connection. Direct and bypassed requests drop the field. Versions before 7.14.2 are affected by these origin-bound credential paths.

Workarounds

If you cannot upgrade immediately, remove first-class Proxy-Authorization fields from requests, client defaults, and middleware. Supply proxy credentials instead through proxy URL userinfo, for example http://user:pass@proxy.example:8080, or use CURLOPT_PROXYUSERPWD with the cURL handlers. Do not combine proxy URL userinfo with a first-class field or a raw stream_context.http.proxy override. If a first-class field is unavoidable, use libcurl 7.37.0 or newer with CURLOPT_PROXYHEADER, CURLOPT_HEADEROPT, and CURLHEADER_SEPARATE, and ensure the field is never present on a client that can issue direct, bypassed, or SOCKS requests or follow redirects into those routes. A newer libcurl is necessary but does not fix Guzzle's route-dependent migration by itself, and disabling redirects reduces but does not eliminate exposure.

References

https://www.rfc-editor.org/rfc/rfc9110.html#section-11.7.2
https://curl.se/libcurl/c/CURLOPT_PROXYHEADER.html
https://curl.se/libcurl/c/CURLOPT_HEADEROPT.html
https://curl.se/libcurl/c/CURLOPT_HTTPHEADER.html

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Show details on source website

JSON

To clipboard

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      "package": {
        "ecosystem": "Packagist",
        "name": "guzzlehttp/guzzle"
      },
      "ranges": [
        {
          "events": [
            {
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            },
            {
              "fixed": "7.14.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-67339"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-201",
      "CWE-522"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-20T21:46:02Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nIn affected versions, the built-in cURL handlers (`CurlHandler` and `CurlMultiHandler`) put every first-class request header in cURL\u0027s origin header list (`CURLOPT_HTTPHEADER`). These handlers are the default when the PHP cURL extension is available. They move `Proxy-Authorization` to the proxy-only list (`CURLOPT_PROXYHEADER`) only when Guzzle predicts an HTTP or HTTPS proxy. A \"first-class\" header is part of the normal request message and can be set on a PSR-7 request, through client `headers` defaults, the `headers` request option, or middleware. It does not include a literal line supplied through raw `CURLOPT_HTTPHEADER`, `CURLOPT_PROXYHEADER`, or `stream_context.http.header` controls.\n\nBecause that migration follows Guzzle\u0027s prediction rather than the route libcurl actually takes, the credential stays in the origin list and is sent to the origin server when a request is:\n\n- direct, including `proxy` set to `\u0027\u0027` to disable proxying.\n- bypassed by a `no`, `no_proxy`, or `NO_PROXY` match.\n- sent through a SOCKS proxy, which does not use the HTTP proxy header channel.\n- redirected from a safely proxied hop into any of those routes: redirect middleware re-evaluates the proxy per hop but, unlike `Authorization` and `Cookie`, does not strip `Proxy-Authorization` cross-origin.\n\nOn installations whose libcurl is older than 7.37.0, or whose PHP cURL extension lacks `CURLOPT_PROXYHEADER`, `CURLOPT_HEADEROPT`, and `CURLHEADER_SEPARATE`, no proxy-only channel is available, so cURL left the header in the origin list for every route. The stream handler also serialized first-class values before selecting a proxy. PHP removes only the first `Proxy-Authorization` line from CONNECT, so another first-class value or a URL-userinfo Basic line could reach the tunneled origin. A later raw `stream_context.http.proxy` override could instead reroute either credential directly to the origin.\n\nThe disclosed value is a private credential meant only for the proxy. RFC 9110 defines `Proxy-Authorization` as credentials for the next inbound proxy, and an origin is never an intended recipient. The flaw can silently give a working proxy credential to an unrelated third party. In the worst case, an attacker controls the origin and records the credential through access logs, tracing systems, or application logs. If it remains valid, the attacker can abuse a paid or access-controlled proxy, impersonate the proxy principal, or reach destinations the proxy is trusted to reach. A strong remote exploit is possible when an application sends a request to an attacker-controlled HTTP URL through a proxy with a default `Proxy-Authorization` header, then follows the attacker\u0027s redirect to an HTTPS or no-proxy destination that Guzzle reaches directly.\n\nUsing a first-class `Proxy-Authorization` header is a legitimate, documented configuration, so affected applications are not misusing the library. Guzzle does not create this field, so applications that never configure one are unaffected by the first-class-header flaw. Proxy URL userinfo is not affected on its own, but the stream handler could expose its Basic line when combined with a first-class field or a later raw `stream_context.http.proxy` override. `CURLOPT_PROXYUSERPWD` is unaffected. Literal lines supplied through raw `CURLOPT_HTTPHEADER`, `CURLOPT_PROXYHEADER`, or `stream_context.http.header` remain caller-controlled and outside the first-class-header guarantee.\n\n### Patches\n\nThe issue is fixed in `7.14.2`. The cURL handlers keep first-class `Proxy-Authorization` values out of the origin header list. When proxy header separation is available, they pass the values through `CURLOPT_PROXYHEADER` with `CURLHEADER_SEPARATE`. An empty value uses cURL\u0027s semicolon form to suppress credentials from proxy URL userinfo. On older builds, Guzzle drops the field for direct, bypassed, and SOCKS routes, but fails before network I/O if the request might use an HTTP or HTTPS proxy.\n\nThe stream handler removes the field from origin headers before choosing a route. If it selects a proxy, it accepts one value, including empty, writes a validated proxy header, and gives that value precedence over proxy URL userinfo. Multiple values, line breaks, and raw proxy overrides that could reroute generated credentials fail before connection. Direct and bypassed requests drop the field. Versions before `7.14.2` are affected by these origin-bound credential paths.\n\n### Workarounds\n\nIf you cannot upgrade immediately, remove first-class `Proxy-Authorization` fields from requests, client defaults, and middleware. Supply proxy credentials instead through proxy URL userinfo, for example `http://user:pass@proxy.example:8080`, or use `CURLOPT_PROXYUSERPWD` with the cURL handlers. Do not combine proxy URL userinfo with a first-class field or a raw `stream_context.http.proxy` override. If a first-class field is unavoidable, use libcurl 7.37.0 or newer with `CURLOPT_PROXYHEADER`, `CURLOPT_HEADEROPT`, and `CURLHEADER_SEPARATE`, and ensure the field is never present on a client that can issue direct, bypassed, or SOCKS requests or follow redirects into those routes. A newer libcurl is necessary but does not fix Guzzle\u0027s route-dependent migration by itself, and disabling redirects reduces but does not eliminate exposure.\n\n### References\n\n* https://www.rfc-editor.org/rfc/rfc9110.html#section-11.7.2\n* https://curl.se/libcurl/c/CURLOPT_PROXYHEADER.html\n* https://curl.se/libcurl/c/CURLOPT_HEADEROPT.html\n* https://curl.se/libcurl/c/CURLOPT_HTTPHEADER.html",
  "id": "GHSA-94pj-82f3-465w",
  "modified": "2026-08-04T12:49:56Z",
  "published": "2026-07-20T21:46:02Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/guzzle/guzzle/security/advisories/GHSA-94pj-82f3-465w"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67339"
    },
    {
      "type": "WEB",
      "url": "https://github.com/guzzle/guzzle/pull/3876"
    },
    {
      "type": "WEB",
      "url": "https://github.com/guzzle/guzzle/commit/9e4580d4b9981e903dc6323fe37f50a96e85b05e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/guzzle/guzzle"
    },
    {
      "type": "WEB",
      "url": "https://github.com/guzzle/guzzle/releases/tag/7.14.2"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-proxy-authorization-header-disclosure"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Guzzle: Proxy-Authorization headers can be sent to origin servers"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-67339 (GCVE-0-2026-67339)

GHSA-32RQ-JHR7-M3HH

Duplicate Advisory

Original Description

GHSA-94PJ-82F3-465W

Impact

Patches

Workarounds

References

Tags

Sightings

Nomenclature